| Document and Entity Information | Mar. 03, 2021 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | FLOWSERVE CORP |
| Amendment Flag | false |
| Entity Central Index Key | 0000030625 |
| Document Type | 8-K |
| Document Period End Date | Mar. 3, 2021 |
| Entity Incorporation State Country Code | NY |
| Entity File Number | 001-13179 |
| Entity Tax Identification Number | 31-0267900 |
| Entity Address, Address Line One | 5215 N. O’Connor Blvd., |
| Entity Address, Address Line Two | Suite 2300 |
| Entity Address, City or Town | Irving |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75039 |
| City Area Code | (972) |
| Local Phone Number | 443-6500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock 125 Par Value [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, $1.25 Par Value |
| Trading Symbol | FLS |
| Security Exchange Name | NYSE |
| Senior Notes [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.25% Senior Notes due 2022 |
| Trading Symbol | FLS22A |
| Security Exchange Name | NYSE |
